NOTE: As their name suggests hints are not exactly Skulls of the Shogun cheats, and are usually just simple (but very useful) tips on how you can unlock secret level, features, find hidden areas and such. Hopefully these will make playing Skulls of the Shogun even more entertaining.

Achievements
A Shogun Is You! (40): Complete the Land of Frozen Fortunes on Normal difficulty.
Devil Inside (10): Power up your General to a Demon.
Epic Win (30): Win an online match that lasts at least 30 rounds, defeating at least 30 enemies.
Gone with the Wind (20): Knock 3 foes off a ledge at once with a Demon Crow Monk's Typhoon spell.
Gum-Splattered Lock-Plucker (20): Complete the Land of Monsoon Meadows on Normal difficulty.
Kingdom of the Golden Skull (20): Earn 30 gold skulls.
Kurokawa Would Be Proud (10): Break a Deadly Alliance in online multiplayer.
Lightning Storm (20): Defeat 5 foes at once with a Salamander Monk's Lightning Storm spell.
Online Multi-Slayer (10): Win a 4-player online multiplayer match.
Out of Line (20): Complete the Shores of the Dead on Normal difficulty.
Out of Your Skull (40): Earn all gold skulls.
Outfoxing Death (20): Bring back a fallen unit with a Demon Fox Monk's Revive spell.
Sound of One Hand Applauding (20): Complete the Land of Golden Harvest on Normal difficulty.
Speed Kills (20): Win a multiplayer match with a 20-second-per-turn time limit.
Speed of the Shogun (30): Complete every level such that your best times for all of them add up to less than 3 hours.
Team Player (10): Win a team deathmatch game with your teammate still alive.
The Bone Collector (20): Earn 15 gold skulls.
Victor of Victorious...Victory (20): Complete the Land of Eternal Blossoms on Normal difficulty.
Web Master (10): Win an online multiplayer match.
Were you using that? (10): Defeat an enemy Monk by haunting its Shrine.